Table 7-2. Voice/Fax Troubleshooting Guide
Condition
Possible Cause
Corrective Action
Volume levels not
1. Input level gain setting too 1. Increase input level gain setting on
sufficient on local
low
on remote voice/fax
remote voice/fax channel a couple
voice/fax channel
channel.
db and
recheck voice quality, refer
to the
V(1/2)IL
command in
Chapter 5.
2. Output level attentuation
2. Decrease output level attenuation
setting too
high on local
setting on local voice/fax channel a
voice/fax channel.
couple db and
recheck voice
quality, refer to
V(1/2)OL
command in Chapter 5.
Local telephone goes
1. Devices not connected to 1. Verify that the devices are attached
off-hook and remote
correct voice/fax channel.
to the correct voice/fax channel
Telephone does
not
RJ-11 connector.
ring. FXS to FXS
Configuration
2. Voice/fax channel
1. Verify that each voice/fax channel
configuration
problem.
is configured correctly (FXS,FXO,
or E&M), destination
channel and
node and composite link.
2. Observe that the
XSG
LED on the
local voice/fax channel lights when
the telephone goes off-hook and
that the
RSG
LED on the remote
FXS configured voice/fax channel
flashes with each ring.
Data throughput slows
1. Too much bandwidth being 1. Decrease voice/fax channel
excessively when one
used up for voice/fax.
digitizing rate to 9600 bps, refer to
or both voice/fax
V(1/2)DR
command in Chapter 5.
channels are active
.
2. Enable, or if active, increase silence
suppression on one or both voice/
fax channels, refer to
V(1/2)SS
command in Chapter 5.
FXS to FXO
1. Device not connected to
1. Verify that the device is attached to
configuration - Local
correct voice/fax channel.
the correct voice/fax channel
telephone does not ring
RJ-11 connector.
2. Voice/fax channel
1. Verify that the voice/fax channels
configuration problem.
are configured correctly (destination
node and channel and composite
link).
2. Verify that local voice/fax interface
type is configured for FXS and
remote interface type is set for
FXO operation, refer to the
VL
command in Chapter 5.
Table 7-2. Voice/Fax Troubleshooting Guide (Continued)
Condition
Possible Cause
Corrective Action
FXS to FXO
3. Change the local or remote
configuration - Local
configuration as needed using the
telephone does not ring
V(1/2)LI
or
V(1/2)RI
command,
(Continued)
refer to Chapter 5.
Parts of words not
1. Part of analog signal
1. Lower the input level gain and the
being heard
being clipped off.
output level attentuation a couple of
db using the
V(1/2)IL
and
V(1/2)OL
commands. Refer to
these commands in Chapter 5.
Voice conversation or
1. Remote connection is
1. Verify the remote interface type at
fax traffic become
different than remote
the site that was just changed
erratic after changing
interface type.
using the
VL
command. Refer to
the remote interface type
Chapter 5.
2. Contact the remote site to verify its
local interface type and change
accordingly using the
V(1/2)RI
command. Refer to Chapter 5.
No communication on
1. Composite link down.
1. Call phone company and verify
either voice/fax channel
communication line.
2. Phone cords for the voice 1. Verify that the phone cords for the
and/or fax machine are
voice and/or fax machine are
either
connected to the
connected to the correct channel
wrong channel or interface.
and/or
